Coffee machine



FIG. 1 is a top left perspective view showing my new design.

FIG. 2 is a front view showing my new design;

FIG. 3 is a rear view showing my new design.

FIG. 4 is a left side view showing my new design.

FIG. 5 is a right, side view showing my new design;

FIG. 6 is a top view showing my new design; and,

FIG. 7 is a bottom view showing my new design.

The broken lines show the counter supporting the coffee machine and from no part of the claimed design. 

CLAIM The ornamental design for a coffee machine, as shown and described. 